J-hook extension



FIG. 1 is a front perspective view of a J-hook extension showing our new design;

FIG. 2 is a side view thereof, the opposite side being a mirror image thereof;

FIG. 3 is an edge view thereof, the opposite edge being a mirror image thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a top view thereof.

The broken line showing of a beam to which the extension is secured, a J- hook connected to the extension, and a pipe supported by the J-hook, are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a J-hook extension, as shown and described. 